CN213751586U - Comprehensive experimental device for power supply and distribution system - Google Patents
Comprehensive experimental device for power supply and distribution system Download PDFInfo
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- CN213751586U CN213751586U CN202120068554.0U CN202120068554U CN213751586U CN 213751586 U CN213751586 U CN 213751586U CN 202120068554 U CN202120068554 U CN 202120068554U CN 213751586 U CN213751586 U CN 213751586U
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Abstract
A comprehensive experimental device for a power supply and distribution system comprises a primary part for power grid incoming, a secondary part for protecting the operation safety of a system circuit and a monitoring part for collecting power supply line parameters to monitor the load operation state of the system. The utility model discloses a part of inlet wire end supplies power and distribution for entire system, wherein use as backup power all the way, guaranteed when the main line goes wrong, can in time replace backup power, the microcomputer circuit protection relevant with the mill power supply has been synthesized, the microcomputer motor protection, function such as haulage and reactive compensation fully oneself willingly into, adopt the industrial field product, circuit model and motor model can both be typical simulation mill's field situation, be favorable to carrying out theoretical analysis and numerical analysis, the control part adopts layering distributed control mode, constitute into control, the protection, measure the automatic real platform of instructing of synthesis as an organic whole, systematically realized factory power supply system's receiving of electricity, power transmission and distribution, the requirement of practical skill training such as control protection.
Description
Technical Field
The utility model belongs to the technical field of the real teaching technique of instructing of simulation and specifically relates to a supply and distribution system comprehensive experiment device.
Background
In the electric power system classroom of colleges and universities, professional learning needs to be carried out by combining experiments and theories, but most of the existing practical training platforms for power supply and distribution system teaching lack corresponding data detection and transmission functions or have safety problems, so that teaching of students is hindered.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide one kind and can satisfy the power distribution system comprehensive experiment device that supplies power distribution system's practical skill training requirements such as receive electricity, transmission of electricity, distribution, control and protection of simulation mill.
The utility model provides a its technical problem take following technical scheme to realize:
a comprehensive experimental device for a power supply and distribution system comprises a primary part for power grid incoming, a secondary part for protecting the operation safety of a system circuit and a monitoring part for collecting power supply line parameters to monitor the load operation state of the system;
the primary part comprises a primary power supply and distribution line connected with a power grid, the primary power supply and distribution line is provided with an isolating switch, a circuit breaker and a transformer and is used for adjusting the operation mode of the primary power supply and distribution line, and the outlet end of the primary power supply and distribution line is connected with a load and is used for providing electric energy for the load;
the secondary part comprises an automatic device, an instrument signal unit and a conversion unit which are arranged on the primary power supply and distribution line;
the monitoring part comprises a touch screen, a PLC (programmable logic controller) and an intelligent acquisition module, the PLC is used for controlling system switching and signal transmission, the intelligent acquisition module is used for acquiring electric energy parameters of a power supply line, a data transmission end of the PLC is connected with the touch screen and the intelligent acquisition module, a control end of the PLC is connected with a load, the PLC acquires states of a circuit breaker in the system and transmits the states to the touch screen, and the load running states are displayed through the touch screen.
Preferably, the voltage of the inlet wire end of the primary power supply and distribution line is 35KV and 10KV, one path of the inlet wire end of the 35KV voltage is stepped down to 10KV to supply power to the load and the automatic device, and the other path is used as a standby power supply.
Preferably, the primary part of the transformers adopt two coils of transformers to simulate a total voltage drop transformer, and the transformer has an on-load voltage regulation function, so that students can know correct electrical switching operation, input operation and adjustment operation rules of various operation modes through correct experimental operation.
Preferably, the load includes a high voltage load and a low voltage load, the high voltage load is simulated by a motor unit, the low voltage load is simulated by a pure resistor and an inductor, and the load further includes a fan for dissipating heat.
Preferably, the automatic device of the secondary part comprises a microcomputer motor protection device arranged at an inlet end of the motor, a microcomputer circuit protection device arranged on a system circuit, a reactive power compensation device and a spare power automatic switching device for a backup power supply, the secondary part integrates functions of microcomputer circuit protection, microcomputer motor protection, spare power automatic switching, reactive power compensation and the like related to factory power supply, industrial field products are adopted, and a circuit model and a motor model can simulate the field condition of a factory more typically, so that theoretical analysis and numerical analysis are facilitated.
Preferably, the working modes of the spare power automatic switching device comprise an incoming line spare power switching mode, a bus coupler spare power switching mode and an emergency spare power switching mode.
Preferably, the instrument signal unit of the secondary part comprises an analog instrument and a light word indicating board for displaying the electric energy parameter and the load parameter.
Preferably, the conversion unit of the secondary part includes a state quantity switch for switching the operation state of the load device.
Preferably, the connecting wires used in the primary part, the secondary part and the monitoring part are of a totally-enclosed pistol inserting type, the interior of the connecting wires is 128 strands formed by oxygen-free copper drawing, the connecting wires are soft, the sheath is made of thick wire diameter and hardening prevention chemicals, and the plug is made of a solid copper piece.
Preferably, the PLC controller is connected with an upper computer through an RS485 bus, a bottom monitoring network is constructed through a Modbus-RTU protocol, a power supply and distribution primary system is configured, changes of main wiring are displayed in real time, various electric quantity parameters are acquired, displayed and stored in real time, real-time and historical curves and reports can be generated for various acquired electric quantities, comparison and analysis of experimental data by experimenters are facilitated, positions of various circuit breakers are monitored, the outlet state of actions is protected, tripping/closing of the circuit breakers of the power transmission line can be controlled, and automatic adjustment of voltage and reactive power is achieved according to the acquired electric quantity of a bus.
The utility model has the advantages that:
the utility model discloses a part of inlet wire end supplies power and distribution for entire system, wherein use as backup power all the way, guaranteed when the main line goes wrong, can in time replace backup power, the microcomputer circuit protection relevant with the mill power supply has been synthesized, the microcomputer motor protection, function such as haulage and reactive compensation fully oneself willingly into, adopt the industrial field product, circuit model and motor model can both be typical simulation mill's field situation, be favorable to carrying out theoretical analysis and numerical analysis, the control part adopts layering distributed control mode, constitute into control, the protection, measure the automatic real platform of instructing of synthesis as an organic whole, systematically realized factory power supply system's receiving of electricity, power transmission and distribution, the requirement of practical skill training such as control protection.
Drawings
Fig. 1 is a schematic circuit diagram of the system of the present invention;
fig. 2 is a schematic circuit wiring diagram of the backup power automatic switching device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiments of the present invention will be described in detail with reference to the accompanying drawings:
as shown in figure 1 and figure 2, a supply distribution system comprehensive experiment device, including the primary part of electric wire netting inlet wire, the secondary part of protection system circuit operation safety and gather the monitoring part of power supply line parameter with monitoring system load running state, the primary part is including connecing the distribution circuit that once supplies of electric wire netting, once supplies to be equipped with isolator, circuit breaker and transformer on the distribution circuit for the operation mode of adjustment once supplying the distribution circuit, once supplies the leading-out terminal connection load of distribution circuit, is used for providing the electric energy for the load. The secondary part comprises an automatic device, an instrument signal unit and a conversion unit which are arranged on the primary power supply and distribution line. The monitoring part comprises a touch screen, a PLC (programmable logic controller) used for controlling system switching and signal transmission and an intelligent acquisition module used for acquiring electric energy parameters of a power supply line, the data transmission end of the PLC is connected with the touch screen and the intelligent acquisition module, the control end of the PLC is connected with a load, the PLC acquires the state of a circuit breaker in the system and transmits the state to the touch screen, and the load running state is displayed through the touch screen. The voltage of the inlet wire end of a primary power supply and distribution line is 35KV and 10KV, one path of the inlet wire end of the 35KV voltage is reduced to 10KV to supply power to a load and an automatic device, the other path is used as a standby power supply, two coils of transformers are adopted as transformers of a primary part to simulate a main reducing transformer, the on-load voltage regulation function is achieved, students can know correct electrical switching operation, input operation and adjustment operation rules of various operation modes through correct experimental operation, the load comprises a high-voltage load and a low-voltage load, the high-voltage load is simulated through a motor set, the low-voltage load is simulated through pure resistance and inductance, and the load further comprises a fan for heat dissipation. The PLC controller is connected with an upper computer through an RS485 bus, a bottom monitoring network is constructed through a Modbus-RTU protocol, a power supply and distribution primary system is configured, the change of a main wiring is displayed in real time, various electric quantity parameters are collected, displayed and stored in real time, real-time and historical curves and reports can be generated for various collected electric quantities, comparison and analysis of experimental data by experimenters are facilitated, the positions of various circuit breakers are monitored, the outlet state of actions is protected, tripping/closing of the circuit breakers of the power transmission line can be controlled, and automatic adjustment of voltage and reactive power is achieved according to the collected electric quantity of a bus.
Furthermore, the microcomputer circuit protection device has the functions of three-section type overcurrent protection, low-voltage latching current protection, single-phase grounding protection, inverse time limit overcurrent protection, pre-overcurrent acceleration, post-overcurrent acceleration, reclosing and the like, the microcomputer motor protection device has the functions of current quick-break, overcurrent, inverse time limit of current, zero-sequence overcurrent protection, negative-sequence current protection, low-voltage protection and the like, the reactive power compensation device can automatically track the power factor of a power grid and control the switching of a capacitor bank, has the functions of manual operation and automatic switching, performs phase-splitting compensation according to the reactive power of a transformer, and the capacitor bank circularly works to enable each group of capacitors to be uniformly put into operation, so that the electric energy loss and the voltage loss are reduced, and the service efficiency of equipment is improved.
Further, the touch screen displays the running electric energy and electric quantity parameters and the switching state quantity of each line in real time, operation commands are downloaded to the PLC and the microcomputer device through the bus, remote control of a power supply line switch and a breaker is executed, switching on and off of a load is carried out, the load running state of the whole system is monitored, a load running curve is generated, alarm prompts are set for line faults, motor faults and overlow power factors, latest event information or protection action information is stored according to time sequence, and remote setting and modification of protection fixed values can be carried out.
As shown in fig. 1, for a large-scale factory and some medium-scale factories with power line incoming voltage of 35KV or more, the voltage is usually reduced twice, that is, after the power enters the factory, the power is firstly dropped to 10KV distribution voltage by a main voltage-reducing substation (HSS) in which a power transformer with large capacity is installed, and then the power is transmitted to each workshop substation by a 10KV high voltage distribution substation (HDS), and then transmitted to the workshop substation (STS) by a high voltage distribution substation, and finally dropped to the voltage required by general low-voltage electric equipment by a distribution transformer of the workshop substation. The total drop substation (HSS) is provided with two 35KV power supply inlet wires, one is a simulated overhead line WL1, and the other is a simulated cable line WL 2.
The incoming line scheme in this embodiment is: one power source is from a power plant or a power system substation as a normal working power source, and the other power source is from a high-voltage connecting line of an adjacent unit as a standby power source. One path of outgoing line of the total voltage reduction substation is 10KV after voltage reduction to a high-voltage distribution substation, and the other path is 35KV of an adjacent branch plant or factory. One incoming line of a high voltage distribution substation (HDS) and a workshop load is a power supply from a main reducing substation and is used as a normal working power supply, and the other incoming line of the high voltage distribution substation and the workshop load is a power supply from an adjacent factory and is used as a standby power supply. The outlet wire of the high-voltage motor is divided into seven paths, wherein two paths are connected to a measuring meter, one path is connected to a reactive compensation cabinet, the three paths are power outlet wires, and the other path is connected to a 10KV analog high-voltage motor set.
Furthermore, the automatic device of the secondary part comprises a microcomputer motor protection device arranged at the inlet end of the motor, a microcomputer circuit protection device arranged on a system circuit, a reactive compensation device and a spare power automatic switching device for a backup power supply, the secondary part integrates functions of microcomputer circuit protection, microcomputer motor protection, spare power automatic switching, reactive compensation and the like related to factory power supply, an industrial field product is adopted, a circuit model and a motor model can simulate the field condition of a factory more typically, theoretical analysis and numerical analysis are facilitated, the working mode of the spare power automatic switching device comprises an inlet spare power automatic switching mode, a bus-coupled spare power automatic switching mode and an emergency spare power automatic switching mode, an instrument signal unit of the secondary part comprises an analog instrument and an optical character indicator board and is used for displaying electric energy parameters and load parameters, and a conversion unit of the secondary part comprises a state quantity switch, for switching the operating state of the load device.
Wherein, the connecting wires used in the primary part, the secondary part and the monitoring part are in a totally-enclosed pistol inserting type, the interior of the connecting wires is 128 folded wires formed by oxygen-free copper drawing, the connecting wires are soft, the sheath is made of thick wire diameter and hardening-proof chemicals, and the plug is made of solid copper.
The comprehensive experiment device in the embodiment meets the national standard, a current type leakage device is arranged at the power supply input end of the experiment device, if the internal and external or strong current output of the control screen has a leakage phenomenon, the main power supply is immediately alarmed and cut off, the experiment safety is ensured, a totally-enclosed safety experiment lead is adopted to avoid electric shock accidents caused by the two hands of students by electric mode, the instrument is provided with an overrange protection function, an alternating current power supply and a direct current power supply have short-circuit protection, the control screen power supply is controlled by a contactor through a start button and a stop button, the output of a voltage regulator is connected with a high-sensitivity electronic circuit overcurrent protection and fuse dual protection function, and the over-current or direct short circuit of an interphase power supply and a line power supply can be automatically protected. The mode that the operation control screen adds the switch board is adopted in this embodiment, fixed structure, the operation control screen is real standard primary circuit, from the top down is total drop substation, high voltage distribution station and workshop load in proper order, the switch board is secondary control loop, is equipped with microcomputer circuit protection device, stand-by power supply automatic input device, converter, idle automatic compensation controller, high-voltage motor microcomputer protection etc. whole structural design both accords with people's vision custom, has simulated the industrial site betterly again, has accorded with the requirement of textbook completely, has still reduced the work load that the teacher changed the experiment module simultaneously.
As shown in fig. 2, the backup power automatic switching is a wiring diagram of the backup power automatic switching, that is, the backup power automatic switching is an automatic switching device, the backup power automatic switching in this embodiment is suitable for incoming line switches of 110kV and below, an internal bridge switch and automatic switching devices of switches on both sides of a main transformer, and optionally has an adaptive function of the backup power automatic switching, and can be assembled in a centralized manner or installed in place in a switch cabinet, and the backup power automatic switching protection device has an effect of automatically switching the backup power to a working bus (incoming line backup power automatic switching) after the working power disappears, so that a load connected to the working bus can still normally operate; or two sections of incoming lines are put into operation at the same time, when a certain section of PT is unqualified, the incoming line breaker at the unqualified end PT is tripped, and then the bus coupler switch is switched on (bus coupler spare power automatic switching). In addition, if the incoming line power supply of the unqualified end PT on the side is recovered (the incoming line voltage or the contact of the electrified display can be detected), the spare power automatic switching device automatically trips the bus-bar switch, and the side incoming line switch is closed (the spare power automatic switching device adopts an adaptive mode).
During specific implementation, the system simulates the power supply and distribution system of a medium-sized factory, a control screen structure is adopted, a main wiring is printed on an aluminum panel, the power supply and distribution system comprises 35kV and 10kV, two different voltage levels are formed, the whole system is provided with two paths of 35kV inlet wires, one path of normal power supply is used, the other path of normal power supply is standby, automatic switching is realized through automatic switching, a 35kV bus outlet wire is provided with two paths of branches, the other path of outlet wire is sent to other branch factories, the other path of outlet wire is locally used through an inlet wire power supply 1 which is subjected to total voltage reduction and voltage reduction to form a 10kV bus, and in order to guarantee the power supply reliability, the other path of outlet wire is used as an inlet wire power supply 2 of the 10kV bus. The incoming line power supply 1 and the incoming line power supply 2 are mutually dark and standby, respectively supply power to a 10kV I section bus and a 10kV II section bus, and can also be automatically switched through spare power automatic switching. In order to ensure the reliability of primary line power supply, a microcomputer spare power automatic switching device, a microcomputer line and a microcomputer transformer protection are configured, in order to ensure the stable operation of a high-voltage motor, the high-voltage motor protection is configured, in order to improve the power consumption quality, a reactive power compensation device is configured, in order to realize automatic control, a PC (personal computer) and a PLC (programmable logic controller) are configured, and the four-remote function of the whole system is realized.
The utility model discloses a part of inlet wire end supplies power and distribution for entire system, wherein use as backup power all the way, guaranteed when the main line goes wrong, can in time replace backup power, the microcomputer circuit protection relevant with the mill power supply has been synthesized, the microcomputer motor protection, function such as haulage and reactive compensation fully oneself willingly into, adopt the industrial field product, circuit model and motor model can both be typical simulation mill's field situation, be favorable to carrying out theoretical analysis and numerical analysis, the control part adopts layering distributed control mode, constitute into control, the protection, measure the automatic real platform of instructing of synthesis as an organic whole, systematically realized factory power supply system's receiving of electricity, power transmission and distribution, the requirement of practical skill training such as control protection.
It should be emphasized that the embodiments described herein are illustrative and not restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also falls within the scope of the present invention, in any other embodiments derived by those skilled in the art according to the technical solutions of the present invention.
Claims (10)
1. The utility model provides a comprehensive experimental apparatus of power supply and distribution system which characterized in that: the system comprises a primary part for power grid incoming, a secondary part for protecting the operation safety of a system circuit and a monitoring part for collecting power supply line parameters to monitor the load operation state of the system;
the primary part comprises a primary power supply and distribution line connected with a power grid, the primary power supply and distribution line is provided with an isolating switch, a circuit breaker and a transformer and is used for adjusting the operation mode of the primary power supply and distribution line, and the outlet end of the primary power supply and distribution line is connected with a load and is used for providing electric energy for the load;
the secondary part comprises an automatic device, an instrument signal unit and a conversion unit which are arranged on the primary power supply and distribution line;
the monitoring part comprises a touch screen, a PLC (programmable logic controller) and an intelligent acquisition module, the PLC is used for controlling system switching and signal transmission, the intelligent acquisition module is used for acquiring electric energy parameters of a power supply line, a data transmission end of the PLC is connected with the touch screen and the intelligent acquisition module, a control end of the PLC is connected with a load, the PLC acquires states of a circuit breaker in the system and transmits the states to the touch screen, and the load running states are displayed through the touch screen.
2. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the voltage of the inlet wire end of the primary power supply and distribution line is 35KV and 10KV, one path of the voltage of the inlet wire end of the 35KV voltage is reduced to 10KV to supply power to the load and the automatic device, and the other path of the voltage is used as a standby power supply.
3. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the transformer of the primary part adopts two coils of transformers to simulate a total drop transformer.
4. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the load comprises a high-voltage load and a low-voltage load, the high-voltage load is simulated through a motor unit, the low-voltage load is simulated through pure resistance and inductance, and the load further comprises a fan for dissipating heat.
5. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the automatic device of the secondary part comprises a microcomputer motor protection device arranged at the inlet wire end of the motor, a microcomputer circuit protection device arranged on a system circuit, a reactive power compensation device and a spare power automatic switching device for a backup power supply.
6. The comprehensive experimental device of the power supply and distribution system of claim 5, characterized in that: the working modes of the spare power automatic switching device comprise an incoming line spare power switching mode, a bus coupler spare power switching mode and an emergency spare power switching mode.
7. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the instrument signal unit of the secondary part comprises an analog instrument and a light character indicating board and is used for displaying electric energy parameters and load parameters.
8. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the conversion unit of the secondary part comprises a state quantity selector switch for switching the operating state of the load device.
9. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the connecting wires used in the primary part, the secondary part and the monitoring part are in a totally-enclosed pistol inserting type, strands made of oxygen-free copper are arranged in the connecting wires, and the plugs are solid copper parts.
10. The comprehensive experimental device of the power supply and distribution system of claim 1, characterized in that: the PLC is connected with an upper computer through an RS485 bus, and a bottom monitoring network is established through a Modbus-RTU protocol.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116316632A (en) * | 2023-03-06 | 2023-06-23 | 英格尔自动化(福建)有限公司 | A Smart Box Transformer Control System |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116316632A (en) * | 2023-03-06 | 2023-06-23 | 英格尔自动化(福建)有限公司 | A Smart Box Transformer Control System |
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